First: Volunteer Jam 3. the best I can remember was Charlie Daniels, Dobie Gray, Marshall Tucker, Part of the Allman Brothers... Sea Level... Oh and Wet Willie.... There were a bunch more too, but those are the ones I remember
Best: George Benson at the Opry House with an orchestra. The music was so acoustically good it brought tears. Best light show was Blue Oyster Cult. Loudest was Ted Nugent. My ears still ring from that. And actually... I saw The Alan Parsons Project at The Fred in Peach Tree City a couple of years ago, and they were AMAZING. Kansas was awesome. The Dixie Dregs at the Exit Inn were amazing.... It is really hard to decide on just one. In the 70s, I saw a BUNCH of concerts. Nashville was awesome in those days and they were affordable.
Worst: Steve Martin at UT. Not his fault, but he got sick, took a break and didn't return to the stage.. I was supposed to see Lynyrd Skynyrd a week after the plane crash. I still have the unused ticket somewhere.